Vacuum freeze-drying machine is mainly used in the fields of medicine,food and biology.And the freeze dryer is also suitable for bulk materials, liquid and solid drying.The pre-freezing and drying process are completed on shelf. It changes traditional complicated operation and prevent product from pollution.It is widely used in medicine, pharmaceutical, biological research, chemical and food and other fields. The freeze-dried items are easy to be stored for a long time. After adding water, the products can be returned to the pre-freeze-dried state and maintain the original biochemical characteristics.